Honestly, it's a sucky requirement on the part of the US government but I don't see it as that big of a deal. For most people, who make an average or above average but not stratospheric living, it's just paperwork. Especially for someone who lives in a country like the UK where tax rates are higher than the US and that has a tax treaty with the US that precludes double taxation, it's an annoyance but it doesn't mean more taxes. And, it is not taxation without representation--overseas citizens retain the right to vote in national elections, for President, for the House and the Senate in their last state of residence. If, god forbid, something were to happen that required me to seek consular services overseas, I'm sure I'll be happy to have those available to me and they have to be funded somehow. Yes, it's an extra annoyance for US citizens born abroad who may never live in the US but if they're aware of the requirement from a young age and file as they should, there really should be no problems down the road.
Now, individual STATES trying to tax overseas citizens who are clearly no longer residents of that state because of the difficult to nail down idea of "domicile," THAT bothers me. Aside from maybe retaining a driver's license, there's not much that the state government will do for me overseas AND there's no right for overseas residents to vote in state or local level elections.